how to sum numbers from two different text files in python

Question

So, i have this problem:

i have three txt-files: number1.txt, number2.txt and number3.txt.

number1.txt have this number: 10 and number2.txt have this number too.

So, what i want to do, is to sum up these numbers and add result to number3.txt.

I have already this code:

number1 = open("files/number1.txt", encoding="utf-8").read()
number2 = open("files/number2.txt", encoding="utf-8").read()
number3 = open("files/number3.txt", "w", encoding="utf-8")
result = float(number1) + float(number2)
number3.write(str(result))

But nothing shows up on the number3.txt. I have no idea why this is not working. I know this is maybe an pretty stupid question, but i hope you guys can help me.

I have python 3.4.3.

Yes, and python printed the right result, but nothing still doesn't appear on number3.txt — Markus Torppa
– Markus Torppa, Commented Oct 8, 2015 at 12:00

Ivana Balazevic · Accepted Answer · 2015-10-08 12:12:05Z

1

It's a good idea to always close your files, and the way you're doing it all of them remain open. In order to do that, use the with command:

with open("files/number1.txt", encoding="utf-8") as f:
  number1 = f.read()
with open("files/number2.txt", encoding="utf-8") as f:
  number2 = f.read()
result = float(number1) + float(number2)
with open("files/number3.txt", "w", encoding="utf-8") as f:
  f.write(result)

That way you don't have to worry about closing your files, since they get closed automatically.

answered Oct 8, 2015 at 12:12

Ivana Balazevic

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Comments

Christian Witts · Accepted Answer · 2015-10-08 11:59:06Z

0

You haven't closed or flushed the file. Make sure you have a number3.close().

answered Oct 8, 2015 at 11:59

Christian Witts

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